add CITATION.cff file

[bgruening]

We talked about this one :)
https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-citation-files

[federicomarini]

Yep - Would be interesting to see if there is a bibtex2cff utility around.

While at it - should go in another issue, but I'll speak up: License files, should they be added explicitly as well?

[bgruening]

Yes to LICENSE files.

[federicomarini]

I am just wondering - since R packages have already the "standardized way" of making them citable with the item in inst/citation, shall this one come on top? I have the impression it is a bit redundant.
@csoneson, got any idea especially re: "regulations" in Bioc?